(a)The return in Form No. 61A referred to in sub-rule (1) shall be furnished to the Director of Income-tax (Intelligence and Criminal Investigation) or the Joint Director of Income-tax (Intelligence and Criminal Investigation) through online transmission of electronic data to a server designated for this purpose under the digital signature of the person specified in sub-rule (7) and in accordance with the data structure specified in this regard by the Principal Director General of Income-tax (Systems):